Minor UI fixes.

- Fix path to spinner
- Fix color for unvisited links
- Include necessary jqueryui images

web/static/css/prometheus.css

@@ -57,7 +57,12 @@ input[name=end_input], input[name=range_input] {
   line-height: 120%;
 }
 
-#navigation a { padding-right: 1em; text-decoration: none }
+#navigation a {
+  color: #F2F2F2;
+  padding-right: 1em;
+  text-decoration: none;
+}
+
 #navigation a:visited { color: #F2F2F2 }
 #navigation a:active { color: #F60 }
 #navigation a:hover { color: #06C }

web/static/js/graph_template.handlebar

@@ -31,7 +31,7 @@
               </div>
               <div class="eval_stats"></div>
             </form>
-            <img src="img/ajax-loader.gif" class="spinner" alt="ajax_spinner">
+            <img src="/static/img/ajax-loader.gif" class="spinner" alt="ajax_spinner">
           </div>
           <div class="grouping_box">
             <div class="graph_container">